One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,8)(3,7,4,6)(10,14)(15,17)(16,21)(22,23)(25,26,30,34,31,35,29,32)(27,36,28,38,37,40,39,33)(1,3,5,4)(2,6,8,7)(9,10,13,14)(11,17,19,15)(12,16,20,21)(18,23,24,22)(26,32)(27,37)(29,30)(33,40)(34,35)(36,38)(1,3,5,4)(2,7,8,6)(9,11,13,19)(10,15,14,17)(12,18,20,24)(16,22,21,23)(25,27)(26,33)(28,29)(30,39)(31,37)(32,36)(34,40)(35,38)(1,4,5,3)(2,6,8,7)(12,20)(16,21)(18,24)(22,23)(25,28)(26,33)(27,29)(30,37)(31,39)(32,40)(34,36)(35,38)(9,12,13,20)(10,16,14,21)(11,18,19,24)(15,22,17,23)(25,29,31,30)(26,32,35,34)(27,28,37,39)(33,36,38,40)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.